TEF668X Radios

The TEF chipsets provide 0.1 to 30 MHz coverage, plus FM broadcast band, but with only AM and wideband FM modes (no CW/SSB) .  There are a few dual chipset TEF668X/Si473X radios that do have SSB/CW.

The user-interface of TEF668x-based radios often have separate tuning and volume knobs, as well as buttons for direct frequency entry similar to more conventional portable radios.   Many TEF-based radios do not have external antenna connections.

Many of the small portable radios with video displays based on the TEF668x chipsets and ESP-32 microprocessors suffer from internally generated noise when they are used with directly attached whip and loop antennas.   Most of these radios include rechargeable batteries that use USB chargers.